Lebanese security officials and the state-run news agency reported Sunday that low-flying Israeli warplanes were violating its air space, overlying territory including the capital Beirut.
The warplanes flew over southern Lebanon, Beirut, the eastern Bekaa Valley and the city of Baalbek, the National News Agency said.
Israeli warplanes regularly enter Lebanese airspace. A Lebanese security official confirmed the Sunday overflights and said they were among the most intense recently. He spoke on condition of anonymity in line with military regulations.
There was no immediate comment from Israel.
The flights come amid heightened regional tensions because of the civil war in Syria.
Israel is believed to have carried out three airstrikes inside Syria this year said to be aimed at weapons meant for the Lebanese Hezbollah.